"Title Case" and "Sentence case" in the headers in docs

[igorlukanin]

Documentation Is:

• Missing or needed?
• Confusing
• Not sure?

Please Explain in Detail...

Some of the page headers and sidebar items use "Title Case" and some of them use "Sentence case".

Your Proposal for Changes

Can be fixed quite trivially.

Example

No response

[AbhayKatoch]

Could you assign me to this please.

[igorlukanin]

Hey @AbhayKatoch, please feel free to submit a PR and/or kick-off a conversation on the scope of this change.

[LeeLenaleee]

Looking through the files the only inconsistent file is https://github.com/chartjs/Chart.js/blob/master/docs/getting-started/installation.md which you already fixed in #10816 so I think this can be closed 🤔

[igorlukanin]

@LeeLenaleee Makes sense!